COMMENTS

Some people say that this is a "deliberate" mistake. Why? Maybe the Jerry-Seinfeld-looking-dude has a fake gun and that's why the revolver on the gun doesn't rotate when it shoots? Maybe God didn't come down and stop the bullets?

:D ... BTW... it's not me who said it was deliberate mistake... it was
https://www.facebook.com/moviemistakes

I think it's just a mistake. Films are not perfect. Even Tarantino films.

Just a mistake. If you see the end of the shooting of Bret in the first act of the movie you will see that Jules empties his gun into Bret, with the slide finishing in the reload position, back of the slide. In the scene you refer to here the gun is not empty, such that he has ammo to kill the hand cannon guy.
The other thing is there are only six holes in the wall. Three around the head of Jules, three which must have travelled through him, hence the miracle.

I believe it was actually a mistake. I am a huge Quentin Tarantino fan and love all the hidden messages he leaves in each of his films. That is why I can watch all of his movies a hundred times and learn something new every time.

However, this is not one of those messages. If you check in the beginning, when Vincent and Jules get to the apartment, one can see that the bullet holes are clearly not there. Also, If you check closely, the revolver on the guy's gun does, in fact, rotate.